The organization responsible for the administration of GST in Karnataka:

Commercial Taxes Department
Income Tax Department
Central Board of Direct Taxes
Central Board of Indirect Taxes and Customs

The correct answer is: A) Commercial Taxes Department.

The Commercial Taxes Department is the government department responsible for the administration of the Goods and Services Tax (GST) in Karnataka. The department was established in 1956 and is headquartered in Bangalore. The department is responsible for collecting GST from taxpayers, issuing refunds, and enforcing compliance with the GST law.

The Income Tax Department is responsible for collecting income tax from individuals and businesses. The Central Board of Direct Taxes (CBDT) is the apex body of the Income Tax Department. The CBDT is responsible for formulating policy and providing guidance to the Income Tax Department.

The Central Board of Indirect Taxes and Customs (CBIC) is the apex body of the Central Board of Excise and Customs (CBEC). The CBIC is responsible for formulating policy and providing guidance to the CBEC. The CBEC is responsible for collecting indirect taxes, such as excise duty, customs duty, and service tax.

The Commercial Taxes Department is the most appropriate organization to administer the GST in Karnataka because it has the experience and expertise in collecting indirect taxes. The department is also familiar with the business environment in Karnataka and is well-positioned to enforce compliance with the GST law.